What is Chomsky Hierarchy in compiler design - The Chomsky hierarchy is a collection of various formal grammars. With the use of this formal grammar, it can generate some formal languages. They can be defined by multiple types of devices that can identif
'Word.Application' is not defined "aspnet_compiler.exe" exited with code 1 "Cannot create ActiveX Component" "Exception from HRESULT: 0x800A03EC" Unable to open excel file "Failed to compare two elements in the array." "Object reference not set to an instance of an object" error which po...
What is Finite Automata in Compiler Design - An automata is an abstract model of digital computers with discrete inputs and outputs. Every automata include a mechanism for reading inputs. It is considered that input is a string over a given alphabet, wri
What is a regular expression engine? A regular expression engine is a program that takes a set of constraints specified in a mini-language, and then applies those constraints to a target string, and determines whether or not the string satisfies the constraints. See perlre for a full ...
'Compile error: "Expression does not produce a value." Console.WriteLine is a Sub procedure (void, in C#), so it doesn’t return a value, which is why the compiler gives an error. To deal with this, Visual Basic 2010 introduces support for statement lambdas, which are lambdas that ca...
In many scenarios, you might want to store key-value pairs in a way where order can be maintained (a list of key-value pairs) but where fast lookup by key is also supported (a dictionary of key-value pairs). Since the early days of .NET, the OrderedDictionary type has supported this...
Class names generated by the SpEL compiler now take the formorg.springframework.expression.spel.generated.CompiledExpression###, where###is a 0-padded counter. Data Access and Transactions Configurable default rollback rules, includingrollbackOnattribute in@EnableTransactionManagement; see23473. Type-l...
If the generated code is going to run enough times, this can be a big win. Or, even without using the compiler at runtime, closures give you another way to meld machine code with runtime data. For instance, the CL-PPCRE regular expression library, running in CMUCL, is faster than ...
Creator of Python, Guido van Rossum said, "Code is much more often than it is written." The code can be written in a few minutes, a few hours, or a whole day but once we have written the code, we will never rewrite it again. But sometimes, we need to read the code again and ...
Expression of logic.In declarative programming, you describe the logic of the computation. For example, in SQL, you express the conditions under which data should be retrieved, or inHTML, you describe the structure of a webpage. The logic is expressed in terms of what you want to achieve ...